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c906108c SS |
1 | /* Parameters for execution on a WDC 65816 machine. |
2 | Copyright (C) 1995 Free Software Foundation, Inc. | |
3 | ||
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
6 | This program is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
c906108c | 10 | |
c5aa993b JM |
11 | This program is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
c906108c | 15 | |
c5aa993b JM |
16 | You should have received a copy of the GNU General Public License |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | /* Contributed by Steve Chamberlain sac@cygnus.com */ | |
22 | ||
23 | #define GDB_TARGET_IS_W65 | |
24 | ||
25 | #define IEEE_FLOAT 1 | |
26 | ||
27 | /* Define the bit, byte, and word ordering of the machine. */ | |
28 | ||
29 | #define TARGET_BYTE_ORDER LITTLE_ENDIAN | |
30 | ||
31 | ||
32 | /* Offset from address of function to start of its code. | |
33 | Zero on most machines. */ | |
34 | ||
35 | #define FUNCTION_START_OFFSET 0 | |
36 | ||
37 | /* Advance PC across any function entry prologue instructions | |
38 | to reach some "real" code. */ | |
39 | ||
40 | extern CORE_ADDR w65_skip_prologue (); | |
41 | ||
42 | #define SKIP_PROLOGUE(ip) \ | |
43 | {(ip) = w65_skip_prologue(ip);} | |
44 | ||
45 | ||
46 | /* Immediately after a function call, return the saved pc. | |
47 | Can't always go through the frames for this because on some machines | |
48 | the new frame is not set up until the new function executes | |
49 | some instructions. | |
50 | ||
51 | The return address is the value saved in the PR register + 4 */ | |
52 | ||
53 | #define SAVED_PC_AFTER_CALL(frame) \ | |
54 | saved_pc_after_call(frame) | |
55 | ||
56 | ||
57 | /* Stack grows downward. */ | |
58 | ||
59 | #define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) | |
60 | ||
61 | /* Illegal instruction - used by the simulator for breakpoint | |
62 | detection */ | |
63 | ||
c5aa993b | 64 | #define BREAKPOINT {0xcb} /* WAI */ |
c906108c SS |
65 | |
66 | /* If your kernel resets the pc after the trap happens you may need to | |
67 | define this before including this file. */ | |
68 | #define DECR_PC_AFTER_BREAK 0 | |
69 | ||
70 | /* Return 1 if P points to an invalid floating point value. */ | |
71 | ||
c5aa993b | 72 | #define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */ |
c906108c SS |
73 | |
74 | /* Say how long registers are. */ | |
c5aa993b | 75 | /*#define REGISTER_TYPE int */ |
c906108c SS |
76 | |
77 | /* Say how much memory is needed to store a copy of the register set */ | |
c5aa993b | 78 | #define REGISTER_BYTES (NUM_REGS*4) |
c906108c SS |
79 | |
80 | /* Index within `registers' of the first byte of the space for | |
81 | register N. */ | |
82 | ||
83 | #define REGISTER_BYTE(N) ((N)*4) | |
84 | ||
85 | /* Number of bytes of storage in the actual machine representation | |
86 | for register N. */ | |
87 | ||
88 | #define REGISTER_RAW_SIZE(N) (((N) < 16) ? 2 : 4) | |
89 | ||
90 | #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N) | |
91 | ||
92 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
93 | ||
94 | #define MAX_REGISTER_RAW_SIZE 4 | |
95 | ||
96 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
97 | ||
98 | #define MAX_REGISTER_VIRTUAL_SIZE 4 | |
99 | ||
100 | /* Return the GDB type object for the "standard" data type | |
101 | of data in register N. */ | |
102 | ||
103 | #define REGISTER_VIRTUAL_TYPE(N) \ | |
104 | (REGISTER_VIRTUAL_SIZE(N) == 2 ? builtin_type_unsigned_short : builtin_type_unsigned_long) | |
105 | ||
106 | /* Initializer for an array of names of registers. | |
107 | Entries beyond the first NUM_REGS are ignored. */ | |
108 | ||
109 | #define REGISTER_NAMES \ | |
110 | {"r0","r1","r2", "r3", "r4", "r5", "r6", "r7", \ | |
111 | "r8","r9","r10","r11","r12","r13","r14","r15", \ | |
112 | "pc","a", "x", "y", "dbr","d", "s", "p", \ | |
113 | "ticks","cycles","insts"} | |
114 | ||
115 | /* Register numbers of various important registers. | |
116 | Note that some of these values are "real" register numbers, | |
117 | and correspond to the general registers of the machine, | |
118 | and some are "phony" register numbers which are too large | |
119 | to be actual register numbers as far as the user is concerned | |
120 | but do serve to get the desired values when passed to read_register. */ | |
121 | ||
122 | #define SP_REGNUM 22 | |
123 | #define FP_REGNUM 15 | |
124 | #define NUM_REGS 27 | |
125 | #define PC_REGNUM 16 | |
126 | #define P_REGNUM 23 | |
127 | ||
128 | /* Store the address of the place in which to copy the structure the | |
129 | subroutine will return. This is called from call_function. | |
130 | ||
131 | We store structs through a pointer passed in R4 */ | |
132 | ||
133 | #define STORE_STRUCT_RETURN(ADDR, SP) \ | |
134 | { write_register (4, (ADDR)); } | |
135 | ||
136 | /* Extract from an array REGBUF containing the (raw) register state | |
137 | a function return value of type TYPE, and copy that, in virtual format, | |
138 | into VALBUF. */ | |
139 | ||
140 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
141 | memcpy (VALBUF, (char *)(REGBUF), TYPE_LENGTH(TYPE)) | |
142 | ||
143 | ||
144 | /* Write into appropriate registers a function return value | |
145 | of type TYPE, given in virtual format. | |
146 | ||
147 | Things always get returned in R4/R5 */ | |
148 | ||
149 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
150 | write_register_bytes (REGISTER_BYTE(4), VALBUF, TYPE_LENGTH (TYPE)) | |
151 | ||
152 | ||
153 | /* Extract from an array REGBUF containing the (raw) register state | |
154 | the address in which a function should return its structure value, | |
155 | as a CORE_ADDR (or an expression that can be used as one). */ | |
156 | ||
157 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF)) | |
158 | ||
159 | /* A macro that tells us whether the function invocation represented | |
160 | by FI does not have a frame on the stack associated with it. If it | |
161 | does not, FRAMELESS is set to 1, else 0. */ | |
162 | ||
392a587b JM |
163 | #define FRAMELESS_FUNCTION_INVOCATION(FI) \ |
164 | (frameless_look_for_prologue (FI)) | |
c906108c SS |
165 | |
166 | #define FRAME_CHAIN(FRAME) w65_frame_chain(FRAME) | |
167 | #define FRAME_SAVED_PC(FRAME) (w65_frame_saved_pc(FRAME)) | |
168 | #define FRAME_ARGS_ADDRESS(fi) (fi)->frame | |
169 | #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame | |
170 | ||
171 | /* Set VAL to the number of args passed to frame described by FI. | |
172 | Can set VAL to -1, meaning no way to tell. */ | |
173 | ||
174 | /* We can't tell how many args there are */ | |
175 | ||
392a587b | 176 | #define FRAME_NUM_ARGS(fi) (-1) |
c906108c SS |
177 | |
178 | /* Return number of bytes at start of arglist that are not really args. */ | |
179 | ||
180 | #define FRAME_ARGS_SKIP 0 | |
181 | ||
182 | /* Put here the code to store, into a struct frame_saved_regs, | |
183 | the addresses of the saved registers of frame described by FRAME_INFO. | |
184 | This includes special registers such as pc and fp saved in special | |
185 | ways in the stack frame. sp is even more special: | |
186 | the address we return for it IS the sp for the next frame. */ | |
187 | ||
188 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ | |
189 | frame_find_saved_regs(frame_info, &(frame_saved_regs)) | |
190 | ||
c906108c SS |
191 | typedef unsigned short INSN_WORD; |
192 | ||
193 | extern CORE_ADDR w65_addr_bits_remove PARAMS ((CORE_ADDR)); | |
194 | #define ADDR_BITS_REMOVE(addr) w65_addr_bits_remove (addr) | |
195 | ||
196 | #define CALL_DUMMY_LENGTH 10 | |
197 | ||
198 | /* Discard from the stack the innermost frame, | |
199 | restoring all saved registers. */ | |
200 | ||
201 | #define POP_FRAME pop_frame(); | |
202 | ||
203 | ||
204 | #define NOP {0xea} | |
205 | ||
206 | #define REGISTER_SIZE 4 | |
207 | ||
208 | #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno) | |
209 | ||
210 | #define TARGET_INT_BIT 16 | |
211 | #define TARGET_LONG_BIT 32 | |
212 | #define TARGET_PTR_BIT 32 |